CN114325124B - Capacitance detection method, device, system and computer readable storage medium - Google Patents
Capacitance detection method, device, system and computer readable storage medium Download PDFInfo
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- CN114325124B CN114325124B CN202111682697.1A CN202111682697A CN114325124B CN 114325124 B CN114325124 B CN 114325124B CN 202111682697 A CN202111682697 A CN 202111682697A CN 114325124 B CN114325124 B CN 114325124B
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- 238000001514 detection method Methods 0.000 title claims abstract description 169
- 239000003990 capacitor Substances 0.000 claims abstract description 332
- 230000036541 health Effects 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000007599 discharging Methods 0.000 claims description 61
- 230000008569 process Effects 0.000 description 14
- 238000004891 communication Methods 0.000 description 9
- 230000006870 function Effects 0.000 description 9
- 238000012423 maintenance Methods 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 3
- YTAHJIFKAKIKAV-XNMGPUDCSA-N [(1R)-3-morpholin-4-yl-1-phenylpropyl] N-[(3S)-2-oxo-5-phenyl-1,3-dihydro-1,4-benzodiazepin-3-yl]carbamate Chemical compound O=C1[C@H](N=C(C2=C(N1)C=CC=C2)C1=CC=CC=C1)NC(O[C@H](CCN1CCOCC1)C1=CC=CC=C1)=O YTAHJIFKAKIKAV-XNMGPUDCSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000003862 health status Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention discloses a capacitance detection method, a device, a system and a computer readable storage medium, wherein the method comprises the following steps: when the detection instruction sent by the fan controller is confirmed to be effective, the capacitor is controlled to discharge, and a first voltage value of the capacitor is obtained; when the first voltage value meets a first preset condition, controlling the capacitor to charge, and obtaining a second voltage value of the capacitor; when the second voltage value meets a second preset condition, calculating a capacitance value of the capacitor, and determining a health state of the capacitor based on the capacitance value; when the detection instruction sent by the fan controller is confirmed to be effective, the capacitor is controlled to discharge and charge, the capacitance value is obtained through calculation when the capacitor is charged, the health state of the capacitor is confirmed based on the capacitance value, and the detection efficiency of the health state detection of the capacitor is improved.
Description
Technical Field
The invention relates to the technical field of wind power, in particular to a capacitance detection method, a device, a system and a computer readable storage medium.
Background
When the power grid is disconnected, the power supply of the pitch drive is switched from the power grid power supply to the capacitor power supply. The variable-pitch driver drives the motor to feathere the blades by means of the power supply of the capacitor, so that the fan is in a safe state. The health state of the capacitor directly determines whether the blade can feathering in time and whether the fan can be in a safe state.
The existing method only charges the capacitor when the voltage of the super capacitor is lower than the floating charging value, and then the capacitance value of the capacitor is read to judge the health state of the capacitor.
Therefore, how to improve the detection efficiency of the health status detection of the capacitor is an urgent problem to be solved.
Disclosure of Invention
The invention mainly aims to provide a capacitance detection method, a device, a system and a computer readable storage medium, which aim to solve the problem of how to improve the detection efficiency of the detection of the health state of a capacitance.
In order to achieve the above object, the present invention provides a capacitance detection method, including the steps of:
when the detection instruction sent by the fan controller is confirmed to be effective, the capacitor is controlled to discharge, and a first voltage value of the capacitor is obtained;
When the first voltage value meets a first preset condition, controlling the capacitor to charge, and obtaining a second voltage value of the capacitor;
And when the second voltage value meets a second preset condition, calculating the capacitance value of the capacitor, and determining the health state of the capacitor based on the capacitance value.
Preferably, the step of controlling the capacitor to discharge and obtaining the first voltage value of the capacitor comprises:
obtaining rectification control authority and charger control authority of the fan controller, and generating a rectification-off instruction to control the driver to enter a rectification-off state;
And controlling the capacitor to enter a discharging state for discharging based on the control authority of the charger according to preset time delay, and acquiring a first voltage value of the capacitor when the capacitor is discharged in real time.
Preferably, when the first voltage value meets a first preset condition, the step of controlling the capacitor to charge and obtaining the second voltage value of the capacitor includes:
Comparing the first voltage value with a voltage threshold, and controlling the capacitor to stop discharging and enter an on-rectification state when the first voltage value is smaller than the voltage threshold;
And acquiring bus voltage and target voltage of the capacitor, comparing the bus voltage with the target voltage, and controlling the capacitor to enter a charging state for charging based on the control authority of the charger if the bus voltage is larger than the target voltage, and acquiring a second voltage value of the capacitor for charging in real time.
Preferably, when the second voltage value meets a second preset condition, the step of calculating the capacitance value of the capacitor includes:
Determining an initial voltage of the capacitor, and comparing a second voltage value of the capacitor when the capacitor is charged with the initial voltage and the target voltage;
When the difference value between the second voltage value and the initial voltage is not smaller than a first threshold value and the difference value between the second voltage value and the target voltage is smaller than a second threshold value, determining the end point voltage of the capacitor according to the second voltage value;
and determining a charging current accumulated value and charging time, and calculating a capacitance value of the capacitor according to the charging current accumulated value, the charging time, the initial voltage and the end voltage.
Preferably, after the step of determining that the detection instruction sent by the fan controller is effective, the method for detecting capacitance further includes:
acquiring the effective time of the detection instruction, and performing timing operation by taking the effective time as a timing starting point;
And if the capacitance detection time is determined to be greater than a preset time threshold, generating a detection timeout flag so that the fan controller determines detection timeout according to the detection timeout flag and exits detection.
Preferably, after the step of controlling the capacitor to discharge and the step of controlling the capacitor to discharge, the capacitance detection method further includes:
if the occurrence of related faults is detected, generating a fault reset mark, and resetting the related faults according to the fault reset mark;
Acquiring a reset result, and if the reset result is that the reset is successful, continuously controlling the capacitor to charge or discharge;
and if the reset result is that the reset fails, controlling the exit detection by the fan controller.
Preferably, after the step of calculating the capacitance value of the capacitor and determining the health state of the capacitor based on the capacitance value when the second voltage value meets a second preset condition, the capacitance detection method further includes:
if the health state of the capacitor is healthy, generating a restoration instruction, and controlling the capacitor to enter a waiting state according to the restoration instruction;
and if the health state of the capacitor is determined to be unhealthy, generating an alarm instruction, and alarming according to the alarm instruction.
In addition, to achieve the above object, the present invention also provides a capacitance detection device, including:
The first control module is used for controlling the capacitor to discharge when the detection instruction sent by the fan controller is confirmed to be effective, and obtaining a first voltage value of the capacitor;
The second control module is used for controlling the capacitor to charge when the first voltage value meets a first preset condition and obtaining a second voltage value of the capacitor;
And the calculating module is used for calculating the capacitance value of the capacitor when the second voltage value meets a second preset condition and determining the health state of the capacitor based on the capacitance value.
Further, the first control module is further configured to:
obtaining rectification control authority and charger control authority of the fan controller, and generating a rectification-off instruction to control the driver to enter a rectification-off state;
And controlling the capacitor to enter a discharging state for discharging based on the control authority of the charger according to preset time delay, and acquiring a first voltage value of the capacitor when the capacitor is discharged in real time.
Further, the first control module is further configured to:
Comparing the first voltage value with a voltage threshold, and controlling the capacitor to stop discharging and enter an on-rectification state when the first voltage value is smaller than the voltage threshold;
And acquiring bus voltage and target voltage of the capacitor, comparing the bus voltage with the target voltage, and controlling the capacitor to enter a charging state for charging based on the control authority of the charger if the bus voltage is larger than the target voltage, and acquiring a second voltage value of the capacitor for charging in real time.
Further, the computing module is further configured to:
Determining an initial voltage of the capacitor, and comparing a second voltage value of the capacitor when the capacitor is charged with the initial voltage and the target voltage;
When the difference value between the second voltage value and the initial voltage is not smaller than a first threshold value and the difference value between the second voltage value and the target voltage is smaller than a second threshold value, determining the end point voltage of the capacitor according to the second voltage value;
and determining a charging current accumulated value and charging time, and calculating a capacitance value of the capacitor according to the charging current accumulated value, the charging time, the initial voltage and the end voltage.
Further, the first control module further includes a timing module, where the timing module is configured to:
acquiring the effective time of the detection instruction, and performing timing operation by taking the effective time as a timing starting point;
And if the capacitance detection time is determined to be greater than a preset time threshold, generating a detection timeout flag so that the fan controller determines detection timeout according to the detection timeout flag and exits detection.
Further, the first control module and the second control module further include a reset module, where the reset module is configured to:
if the occurrence of related faults is detected, generating a fault reset mark, and resetting the related faults according to the fault reset mark;
Acquiring a reset result, and if the reset result is that the reset is successful, continuously controlling the capacitor to charge or discharge;
if the reset result is that the reset fails, the fan controller controls the exit detection
Further, the computing module further includes a check generating module for:
if the health state of the capacitor is healthy, generating a restoration instruction, and controlling the capacitor to enter a waiting state according to the restoration instruction;
and if the health state of the capacitor is determined to be unhealthy, generating an alarm instruction, and alarming according to the alarm instruction.
In addition, to achieve the above object, the present invention also provides a capacitance detection system, including: the capacitive sensing device comprises a memory, a processor and a capacitive sensing program stored on the memory and capable of running on the processor, wherein the capacitive sensing program realizes the steps of the capacitive sensing method when being executed by the processor.
In addition, in order to achieve the above object, the present invention also provides a computer-readable storage medium having stored thereon a capacitance detection program which, when executed by a processor, implements the steps of the capacitance detection method as described above.
According to the capacitance detection method, when the fact that the detection instruction sent by the fan controller is effective is determined, the capacitor is controlled to discharge, and the first voltage value of the capacitor is obtained; when the first voltage value meets a first preset condition, controlling the capacitor to charge, and obtaining a second voltage value of the capacitor; when the second voltage value meets a second preset condition, calculating a capacitance value of the capacitor, and determining a health state of the capacitor based on the capacitance value; when the detection instruction sent by the fan controller is confirmed to be effective, the capacitor is controlled to discharge and charge, the capacitance value is obtained through calculation when the capacitor is charged, the health state of the capacitor is confirmed based on the capacitance value, and the detection efficiency of the health state detection of the capacitor is improved.
Drawings
FIG. 1 is a schematic diagram of a device architecture of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a flow chart of a first embodiment of a capacitive sensing method according to the present invention;
FIG. 3 is a schematic illustration of a pitch drive of the present invention;
Fig. 4 is a schematic diagram showing the state switching of the capacitance of the pitch drive according to the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic device structure of a hardware running environment according to an embodiment of the present invention.
The device of the embodiment of the invention can be a PC or a server device.
As shown in fig. 1, the apparatus may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
It will be appreciated by those skilled in the art that the device structure shown in fig. 1 is not limiting of the device and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components.
As shown in fig. 1, an operating system, a network communication module, a user interface module, and a capacitance detection program may be included in the memory 1005, which is one type of computer storage medium.
The operating system is a program for managing and controlling the portable storage device and the software resource, and supports the operation of a network communication module, a user interface module, a capacitance detection program and other programs or software; the network communication module is used to manage and control the network interface 1002; the user interface module is used to manage and control the user interface 1003.
In the storage device shown in fig. 1, the storage device invokes a capacitance detection program stored in a memory 1005 through a processor 1001, and performs operations in the respective embodiments of the capacitance detection method described below.
Based on the hardware structure, the embodiment of the capacitance detection method is provided.
Referring to fig. 2, fig. 2 is a flow chart of a first embodiment of a capacitance detection method according to the present invention, where the method includes:
Step S10, when a detection instruction sent by a fan controller is confirmed to be effective, a capacitor is controlled to discharge, and a first voltage value of the capacitor is obtained;
Step S20, when the first voltage value meets a first preset condition, controlling the capacitor to charge, and obtaining a second voltage value of the capacitor;
And step S30, calculating the capacitance value of the capacitor when the second voltage value meets a second preset condition, and determining the health state of the capacitor based on the capacitance value.
The capacitance detection method is applied to a pitch drive of the pitch drive, as shown in fig. 3, the pitch drive comprises, but is not limited to, a communication unit, a charger and a brake unit, wherein the communication unit (Canopen communication) is connected with a fan controller (fan programmable logic controller PLC), the charger is connected with a capacitor (super capacitor), the brake unit is connected with a brake resistor, RST represents a power supply of a power grid, UVW represents three-phase output of the pitch drive for controlling a Motor (Paddle), and the Motor controls a blade (Paddle) to rotate; for convenience of description, a pitch drive will be described as an example; when the variable pitch drive determines that a detection instruction sent by a fan controller (a fan Programmable Logic Controller (PLC)) is effective, the rectification control authority of the fan controller and the control authority of a charger are obtained, and a rectification-off instruction is generated to control the variable pitch drive to enter a rectification-off state; the variable pitch drive controls the capacitor to enter a discharge state for discharging according to a preset time delay, acquires a first voltage value when the capacitor is discharged in real time, compares the first voltage value with a voltage threshold, controls the capacitor to stop discharging when the first voltage value is smaller than the voltage threshold, and generates an open rectifying command to control the variable pitch drive to enter an open rectifying state; the variable pitch driver acquires the bus voltage and the target voltage of the capacitor, compares the bus voltage with the target voltage, and controls the capacitor to enter a charging state for charging if the bus voltage is greater than the target voltage, and acquires a second voltage value of the capacitor in real time when the capacitor is charged; the driver determines the initial voltage of the capacitor, compares a second voltage value with the initial voltage and the target voltage when the capacitor is charged, and determines the end voltage of the capacitor according to the second voltage value when the difference value between the second voltage value and the initial voltage is not smaller than a first threshold value and the difference value between the second voltage value and the target voltage is smaller than a second threshold value; the variable pitch drive obtains charging current and charging time, calculates a capacitance value of the capacitor according to the charging current, the charging time, the initial voltage and the end point voltage, and determines a health state of the capacitor based on the capacitance value. It should be noted that the first voltage value is a voltage value of the capacitor in a discharging process, the first voltage value is smaller and smaller along with the discharging of the capacitor, the second voltage value is a voltage value of the capacitor in a charging process, and the second voltage value is larger and larger along with the charging of the capacitor.
In the capacitor detection method of the embodiment, when the detection instruction sent by the fan controller is confirmed to be effective, the capacitor is controlled to discharge, and a first voltage value of the capacitor is obtained; when the first voltage value meets a first preset condition, controlling the capacitor to charge, and obtaining a second voltage value of the capacitor; when the second voltage value meets a second preset condition, calculating a capacitance value of the capacitor, and determining the health state of the capacitor based on the capacitance value; when the detection instruction sent by the fan controller is confirmed to be effective, the capacitor is controlled to discharge and charge, the capacitance value is obtained through calculation when the capacitor is charged, the health state of the capacitor is confirmed based on the capacitance value, and the detection efficiency of the health state detection of the capacitor is improved.
The following will explain each step in detail:
Step S10, when a detection instruction sent by a fan controller is confirmed to be effective, a capacitor is controlled to discharge, and a first voltage value of the capacitor is obtained;
In this embodiment, when the fan controller needs to perform capacitance detection, a detection instruction is sent to the pitch-controlled driver, and when the pitch-controlled driver receives the detection instruction, the pitch-controlled driver detects whether the detection instruction issued by the fan controller is a rising edge signal, detects whether the pitch-controlled driver is in a shutdown state, detects that a blade shutdown signal or a limit position signal is effective, detects whether the voltage of the capacitor is greater than 400V, and when the above conditions are met simultaneously, the pitch-controlled driver determines that the detection instruction is effective, controls the capacitor to discharge, and acquires a first voltage value of the capacitor in a discharging process in real time. It should be noted that, the detection instruction sent by the fan controller to the driver is a digital signal, that is, a signal which is not "0", that is, "1", and the rising edge signal is a signal which is sent by the fan controller and is skipped from "0" to "1"; since the blade is stopped at a preset safety position when the blade is stopped, so as to ensure the safety of the blade, when the blade is stopped at the safety position, a blade stop signal or a limit position signal is effective.
Specifically, the step of controlling the capacitor to discharge and obtaining the first voltage value of the capacitor includes:
step a, obtaining rectification control authority and charger control authority of the fan controller, and entering a rectification-off state;
In the step, when the pitch drive determines that the detection command is effective, the rectification control authority and the charger control authority of the fan controller are obtained, at the moment, the fan controller cannot control the rectification and the charger as in the normal operation, the rectification and the charger can only be controlled by the pitch drive, the pitch drive generates a corresponding off rectification command based on the rectification control authority, and the pitch drive is controlled to enter an off rectification state by the off rectification command; such as: when the variable-pitch driver determines that the detection instruction is effective, the rectification control authority of the fan controller and the control authority of the charger are acquired, namely, the rectification control mode is switched into digital control by automatic control, the variable-pitch driver sets the rectification instruction to 0 based on the digital control, a rectification closing instruction is generated, a switch of a rectifier bridge in the variable-pitch driver is controlled by the rectification closing instruction, and the connection between a power grid power supply and a capacitor is disconnected, so that the variable-pitch driver enters a rectification closing state. It should be noted that, when the current of the power supply is transferred to the load, the rectification is referred to as rectification, and the off-rectification can be understood as preventing the capacitor from being charged, (mainly because the rectification is required when the capacitor is discharged, otherwise, the braking resistor is damaged when the braking resistor is discharged to the power grid).
And b, controlling the capacitor to enter a discharging state for discharging based on the control authority of the charger according to preset time delay, and acquiring a first voltage value of the capacitor for discharging in real time.
In this step, the variable pitch driver controls the capacitor to enter a discharge state according to a preset time delay, and the variable pitch driver generates a discharge instruction based on the control authority of the charger, controls the capacitor to discharge, and acquires a first voltage value when the capacitor discharges in real time, for example: the preset time delay is preset in the variable-pitch driver in advance, is generally 20ms, waits for 20ms after the variable-pitch driver enters the off-rectification state, controls the capacitor to enter the discharge state, and after the variable-pitch driver acquires the control authority of the charger, the control mode of the charger is changed from the function code control to the terminal control, and the variable-pitch driver generates a terminal discharge instruction based on the control authority of the charger to control the capacitor to discharge and acquire a first voltage value of the capacitor to discharge in real time.
Step S20, when the first voltage value meets a first preset condition, controlling the capacitor to charge, and obtaining a second voltage value of the capacitor;
In this embodiment, the pitch drive acquires a first voltage value of the capacitor in real time when the capacitor discharges, and when the pitch drive determines that the first voltage value meets a first preset condition, the pitch drive controls the capacitor to stop discharging and controls the pitch drive to enter an on rectification state, then controls the capacitor to enter a charging state for charging, and acquires a second voltage value of the capacitor when the capacitor charges.
Specifically, step S20 includes:
C, comparing the first voltage value with a voltage threshold, and controlling the capacitor to stop discharging and generating an on-rectification instruction to control the driver to enter an on-rectification state when the first voltage value is smaller than the voltage threshold;
In the step, a pitch drive acquires a first voltage value of a capacitor in real time when discharging, compares the first voltage value with a voltage threshold, and controls the capacitor to stop discharging and generate an on-rectifying command when determining that the first voltage value is smaller than the voltage threshold and controls the pitch drive to enter an on-rectifying state through the on-rectifying command; such as: the variable pitch driver acquires a first voltage value of the capacitor in real time when discharging, compares the first voltage value with a voltage threshold, clears a terminal discharging instruction when determining that the first voltage value is smaller than the voltage threshold, controls the capacitor to stop discharging, sets a rectification instruction to 1 based on digital control, generates an on rectification instruction, controls a switch of a rectifier bridge in the variable pitch driver through the on rectification instruction, and closes the connection of a power grid power supply and the super capacitor to enable the variable pitch driver to enter an on rectification state; the voltage threshold is set in the driver in advance according to the actual situation, and is generally 20% of the voltage of the capacitor in the fully charged state, that is, if the voltage of the capacitor in the fully charged state is 500V, the voltage threshold is 100V, which is helpful for improving the accuracy of calculating the capacitance value of the capacitor.
And d, acquiring bus voltage and target voltage of the capacitor, comparing the bus voltage with the target voltage, and controlling the capacitor to enter a charging state for charging based on the control authority of the charger if the bus voltage is larger than the target voltage, and acquiring a second voltage value of the capacitor for charging in real time.
In the step, after the variable pitch driver enters an on rectification state, the variable pitch driver acquires corresponding bus voltage and target voltage of the capacitor, compares the bus voltage with the target voltage of the capacitor, controls the capacitor to enter a charging state if the bus voltage is larger than the target voltage, simultaneously adjusts charging current of the charger, controls the capacitor to charge, and acquires a second voltage value of the capacitor in real time when the capacitor is charged. Such as: after the control authority of the charger is obtained, the control mode of the charger is changed from function code control to terminal control, when the bus voltage is determined to be larger than the target voltage, the variable pitch driver generates a terminal charging instruction based on the control authority of the charger, detects whether the charging current of the charger connected with the capacitor is smaller than a preset current, adjusts the charging current of the charger to be larger than the preset current if the charging current is smaller than the preset current, and controls the capacitor to charge based on the terminal charging instruction and the adjusted charging current; the braking unit of the variable pitch driver is connected with a braking resistor, and the braking resistor is used for discharging the super capacitor; the target voltage is a voltage value which is required to be achieved by charging in the detection process of the capacitor and is set in advance according to actual conditions; the preset current is set according to actual conditions and is generally 2A to 2.5A, and the adjusted charging current is generally 5A to 5.5A, so that the accuracy of calculating the capacitance value of the capacitor is improved.
And step S30, calculating the capacitance value of the capacitor when the second voltage value meets a second preset condition, and determining the health state of the capacitor based on the capacitance value.
In this embodiment, in the process of controlling the capacitor to charge, the second voltage of the capacitor is larger and larger along with the progress of charging, the pitch driver acquires the second voltage value of the capacitor in real time, in the initial stage of charging the capacitor, the pitch driver determines the initial voltage of the capacitor according to the acquired second voltage value, in the end stage of charging the capacitor, the pitch driver compares the acquired second voltage value with the initial voltage of the capacitor and the target voltage of the capacitor respectively, when the second voltage value meets a second preset condition, the pitch driver determines the end voltage of the capacitor, the pitch driver determines the charging current accumulated value and the charging time, and calculates the capacitance value of the capacitor according to the charging current accumulated value, the charging time, the initial voltage and the end voltage, if the capacitance value of the capacitor is greater than the preset capacitance value, the pitch driver determines the health state of the capacitor to be healthy, and if the capacitance value of the capacitor is not greater than the preset capacitance value, the health state of the capacitor is determined to be unhealthy; when the variable pitch driver controls the capacitor to charge, charging current is determined, and when a second voltage value of the capacitor meets a second preset condition, namely after the capacitor stops charging, the variable pitch driver calculates a charging current accumulated value according to the charging current; the pitch drive is used for timing all the time, when the pitch drive is used for controlling the capacitor to start charging, the charging start time of the capacitor is obtained, when the capacitor is charged, the charging end time of the capacitor is obtained, and the charging time is calculated according to the charging start time and the charging end time.
Specifically, when the second voltage value satisfies a second preset condition, the step of calculating the capacitance value of the capacitor includes:
Step e, determining the initial voltage of the capacitor, and comparing the second voltage value of the capacitor when the capacitor is charged with the initial voltage and the target voltage respectively;
In the step, the pitch drive determines the target voltage of the capacitor before controlling the capacitor to enter a charging state, and in the initial stage of charging the capacitor, the pitch drive determines the initial voltage of the capacitor according to the acquired second voltage value, acquires the second voltage value of the capacitor in real time when the capacitor is charged, and compares the second voltage value with the initial voltage and the target voltage respectively.
F, determining an end point voltage of the capacitor according to the second voltage value when the difference value between the second voltage value and the initial voltage is not smaller than a first threshold value and the difference value between the second voltage value and the target voltage is smaller than a second threshold value;
In the step, the pitch drive compares the second voltage value with the initial voltage and the target voltage respectively, and if the comparison result is that the difference value between the second voltage value and the initial voltage is not smaller than a first threshold value and the difference value between the second voltage value and the target voltage is smaller than a second threshold value, the end voltage of the capacitor is determined according to the second voltage value; such as: according to the actual situation, a first threshold value is set to be 5V in the variable-pitch driver in advance, a second threshold value is set to be 2V, the variable-pitch driver acquires a second voltage value of the capacitor in the charging process in real time, the second voltage value is respectively compared with the initial voltage and the target voltage, and when a comparison result is obtained that the difference value between the second voltage value and the initial voltage is not smaller than 5V and the difference value between the second voltage value and the target voltage is smaller than 2V, the terminal voltage of the capacitor charging is determined according to the second voltage value at the moment.
And g, determining a charging current accumulated value and charging time, and calculating the capacitance value of the capacitor according to the charging current accumulated value, the charging time, the initial voltage and the end voltage.
In this step, the pitch drive determines a charging current accumulated value from the start of charging to the end of charging in the process of controlling the capacitor to charge, and the pitch drive is constantly counting time, calculates a charging time from the charging start time and the charging end time, and calculates a capacitance value of the capacitor from the charging current accumulated value, the charging time, the initial voltage, and the end voltage. It should be noted that, when the pitch drive calculates the capacitance value for the first time, the following formula is directly used: c=Σi/- Δu, wherein C represents the capacitance value, Σi represents the charging current accumulation value, Δt represents the charging time, and Δu represents the difference between the initial voltage and the end voltage; when the pitch drive does not calculate the capacitance value for the first time, the capacitance value of the capacitance calculated this time is directly calculated according to the formula c=Σi Δt/Δu, the capacitance value calculated last time is obtained, and the final capacitance value is obtained by filtering calculation according to the formula c1= (c×3+c2)/2, wherein C1 represents the final capacitance value, C represents the capacitance value calculated last time, and C2 represents the capacitance value calculated this time.
When the variable pitch drive of the embodiment determines that a detection instruction sent by a fan controller (a programmable logic controller) is effective, the rectification control authority of the fan controller and the control authority of a charger are obtained, and a rectification closing instruction is generated to control the variable pitch drive to enter a rectification closing state; the variable pitch drive controls the capacitor to enter a discharge state for discharging according to a preset time delay, acquires a first voltage value when the capacitor is discharged in real time, compares the first voltage value with a voltage threshold, controls the capacitor to stop discharging when the first voltage value is smaller than the voltage threshold, and generates an open rectification command to control the variable pitch drive to enter an open rectification state; the variable pitch driver acquires the bus voltage and the target voltage of the capacitor, compares the bus voltage with the target voltage, and controls the capacitor to enter a charging state for charging if the bus voltage is greater than the target voltage, and acquires a second voltage value of the capacitor in real time when the capacitor is charged; the variable pitch driver determines the initial voltage of the capacitor, compares a second voltage value of the capacitor with the initial voltage and the target voltage respectively when the capacitor is charged, and determines the end voltage of the capacitor according to the second voltage value when the difference value between the second voltage value and the initial voltage is not smaller than a first threshold value and the difference value between the second voltage value and the target voltage is smaller than a second threshold value; the variable pitch driver obtains charging current and charging time, calculates the capacitance value of the capacitor according to the charging current, the charging time, the initial voltage and the end point voltage, determines the health state of the capacitor based on the capacitance value, and improves the detection efficiency of the health state detection of the capacitor.
Further, based on the first embodiment of the capacitance detection method of the present invention, a second embodiment of the capacitance detection method of the present invention is provided.
The second embodiment of the capacitance detection method is different from the first embodiment of the capacitance detection method in that, after the step of determining that the detection instruction sent by the fan controller is effective, the capacitance detection method further includes:
step h, acquiring the effective time of the detection instruction, and taking the effective time as a timing starting point to perform timing operation;
and i, if the capacitance detection time is determined to be greater than a preset time threshold, generating a detection timeout mark so that the fan controller determines detection timeout according to the detection timeout mark and exits detection.
In this embodiment, after determining that the detection instruction sent by the fan controller is effective, the pitch drive acquires the effective time of the detection instruction, and performs timing operation with the effective time of the detection instruction as a timing start point, in the timing process, if the pitch drive determines that the capacitance detection time is greater than a preset time threshold, a detection timeout flag is generated, when detecting the detection timeout flag, the fan controller determines that the detection is timeout according to the detection timeout flag, and sends an exit detection instruction to the pitch drive, so that the pitch drive exits from detecting the capacitance health condition, and returns data recorded in the incomplete detection and corresponding instructions to the fan controller, for example, the rectification control authority and the charger control authority are returned to the fan controller, the rectification control mode is switched from digital control to automatic control, the charger control mode is modified from terminal control to function code control, the charging instruction and the discharging instruction are cleared, the timing time and the timeout flag are cleared, and the charging current of the charger is restored, and the like.
The variable pitch driver in the embodiment obtains the effective time of the detection instruction, and performs timing operation by taking the effective time as a timing starting point; if the capacitance detection time is determined to be greater than the preset time threshold, a detection timeout flag is generated, so that the fan controller determines detection timeout according to the detection timeout flag and exits detection. The detection of the capacitor cannot be timely withdrawn after overtime caused by other special reasons, the normal operation of the variable pitch driver is affected, and the detection efficiency of the health state detection of the capacitor is improved.
Further, based on the first embodiment and the second embodiment of the capacitance detection method of the present invention, a third embodiment of the capacitance detection method of the present invention is proposed.
The third embodiment of the capacitance detection method is different from the first and second embodiments of the capacitance detection method in that, after the step of controlling the capacitance to discharge and the step of controlling the capacitance to discharge, the capacitance detection method further includes:
Step j, if the occurrence of related faults is detected, generating a fault reset mark, and resetting the related faults according to the fault reset mark;
step k, acquiring a reset result, and if the reset result is that the reset is successful, continuously controlling the capacitor to charge or discharge;
And step l, if the reset result is that the reset fails, controlling the exit detection by the fan controller.
In this embodiment, after the control capacitor is charged or the control capacitor is discharged, if a charging related fault or a discharging charging fault is detected, a fault reset flag is generated, and the charging related fault or the discharging charging fault is reset according to the fault reset flag; the variable pitch driver acquires a reset result, and if the reset result is that the reset is successful, the capacitor is continuously controlled to discharge or discharge; if the reset result is that the reset fails, the fan controller is informed to send out an exit detection instruction, so that the driver exits the detection of the health condition of the capacitor.
The following details the individual steps:
Step j, if the occurrence of related faults is detected, generating a fault reset mark, and resetting the related faults according to the fault reset mark;
In the step, after the control capacitor is discharged or the control capacitor is discharged, if the charging related fault or the discharging and charging fault is detected, a fault reset mark is generated, and the charging related fault or the discharging and charging fault is reset according to the fault reset mark; such as: after the control capacitor is discharged or the control capacitor is discharged, if the variable pitch driver detects that a discharge related fault (including a brake pipe fault, a brake resistor fault, a fan fault and the like) occurs, a discharge fault reset mark is set; if detecting that charging related faults (including overcurrent, short circuit, open circuit, overtime, overvoltage faults and the like of the charger) occur, setting a charging fault reset mark; the pitch drive resets the discharge fault according to the discharge fault reset flag or resets the charge fault according to the charge fault reset flag.
Step k, acquiring a reset result, and if the reset result is that the reset is successful, continuously controlling the capacitor to charge or discharge;
In the step, the pitch drive acquires a fault reset result, and if the reset result is that the reset is successful, the capacitor is continuously controlled to charge or discharge, for example: when the pitch drive sets a discharge fault reset mark, the pitch drive resets the discharge related fault according to the discharge fault reset mark, wherein the pitch drive can determine the specific position of the discharge related fault according to the discharge fault reset mark so as to accurately reset the discharge related fault; the step of resetting the charge-related fault is similar to the step of resetting the discharge-related fault described above, and will not be repeated here.
And step l, if the reset result is that the reset fails, controlling the exit detection by the fan controller.
In the step, the variable pitch drive acquires a fault reset result, and if the reset result is a reset failure, the fan controller controls the exit detection; such as: when the pitch drive sets a discharge fault reset mark, the pitch drive resets the discharge related faults according to the discharge fault reset mark, when the pitch drive determines that the number of times of carrying out discharge fault reset record reaches a preset number of times and the reset of the discharge related faults still cannot be completed, a reset result of reset failure is sent to a fan controller, the fan controller sends a withdrawal detection instruction to the pitch drive, so that the pitch drive withdraws from the detection of the capacitor health condition, and returns data recorded in the incomplete detection and corresponding instructions and the like to the fan controller, for example, the rectification control authority and the charger control authority are returned to the fan controller, the rectification control mode is switched from digital control to automatic control, the charger control mode is modified from terminal control to function code control, the charging instruction and the discharge instruction are cleared, the timing time and the timeout mark are cleared, the charging current of the charger is restored, the charging and discharging fault reset instruction and the fault reset record number of times are cleared, and the like are notified to relevant maintenance personnel for fault maintenance.
After the control capacitor is discharged or the control capacitor is discharged, if the variable pitch driver in the embodiment detects that a charging related fault or a discharging and charging fault occurs, a fault reset mark is generated, and the charging related fault or the discharging and charging fault is reset according to the fault reset mark; the variable pitch driver acquires a reset result, and if the reset result is that the reset is successful, the capacitor is continuously controlled to discharge or discharge; if the reset result is that the reset fails, the fan controller is informed to send out an exit detection instruction, so that the variable pitch driver exits the detection of the capacitor health condition. The detection of the capacitor cannot be carried out continuously due to the fact that the detection cannot be carried out timely when the related faults of charging and discharging cannot be carried out, the normal operation of the variable pitch drive is affected, and the detection efficiency of the health state detection of the capacitor is improved.
Further, a fourth embodiment of the capacitance detection method of the present invention is proposed based on the first, second and third embodiments of the capacitance detection method of the present invention.
The fourth embodiment of the capacitance detection method differs from the first, second, and third embodiments of the capacitance detection method in that, after step S30, the capacitance detection method further includes:
Step n, if the health state of the capacitor is determined to be healthy, generating a restoration instruction, and controlling the capacitor to enter a waiting state according to the restoration instruction;
And m, if the health state of the capacitor is determined to be unhealthy, generating an alarm instruction, and alarming according to the alarm instruction.
In this embodiment, the pitch drive compares the calculated capacitance value with a preset capacitance value, and if the capacitance value of the capacitor is greater than the preset capacitance value, determines that the health state of the capacitor is healthy, generates a restoration instruction, and controls the capacitor to enter a waiting state according to the restoration instruction; if the capacitance value of the capacitor is not greater than the preset capacitance value, determining that the health state of the capacitor is unhealthy, generating an alarm instruction, and alarming according to the alarm instruction. Such as: the variable-pitch driver determines that the health state of the capacitor is healthy, generates a restoration instruction, returns the rectification control authority and the charger control authority to the fan controller according to the restoration instruction, switches the rectification control mode from digital control to automatic control, modifies the charger control mode from terminal control to function code control, clears the charging instruction and the discharging instruction, clears the timing time and the overtime mark, restores the charging current of the charger, clears the charging and discharging fault reset instruction, fault reset record times and the like, so that the capacitor enters a waiting state and waits for the next capacitor health state detection; and determining that the health state of the capacitor is unhealthy, generating an alarm instruction, and alarming to related maintenance personnel according to the alarm instruction. When the health state of the capacitor is unhealthy, related personnel can be informed of maintenance in time, and the detection efficiency of the health state detection of the capacitor can be improved.
In particular implementations, as shown in figure 4,
When the variable pitch drive receives the detection instruction, it detects whether the fan controller (fan programmable logic controller PLC) issues the detection instruction as a rising edge signal, detects whether the variable pitch drive is in a stop state, detects that a blade stop signal or a limit position signal is effective, detects whether the voltage of a capacitor is greater than 400V, when the conditions are met simultaneously, the variable pitch drive determines that the detection instruction is effective, controls the variable pitch drive to switch from a waiting state to a rectification closing state, and synchronously prohibits the fan controller from modifying a drive function code through PDO, namely, the drive acquires rectification control authority and charger control authority of the fan controller.
When the variable pitch driver is in a rectification-off state, the variable pitch driver switches a rectification control mode from automatic control to digital control, sets a rectification instruction to 0 through digital control, generates a rectification-off instruction, and controls a capacitor to enter a discharge state after delay is 20ms (preset time delay);
When the capacitor is in a discharging state, the variable pitch driver modifies a control mode of the charger from function code control to terminal control, and simultaneously generates a terminal discharging instruction to control the capacitor entering the discharging state to discharge; detecting a brake resistor in the discharging process of the capacitor, determining whether a discharging related fault occurs, and resetting the discharging related fault when the discharging related fault is determined to occur; when the first voltage value of the capacitor is lower than the voltage threshold value during discharging, the zero clearing terminal discharging command controls the capacitor to stop discharging, and controls the variable pitch driver to switch to an on rectifying state;
When the variable pitch driver is in an on rectification state, the variable pitch driver switches a rectification control mode from automatic control to digital control, sets a rectification instruction to 1 through digital control, generates an on rectification instruction, and controls a capacitor to enter a charging state when the variable pitch driver determines that the bus voltage is greater than the target voltage of the charger;
When the capacitor is in a charging state, the variable pitch driver modifies a charging machine control mode from function code control to terminal control, and generates a terminal charging instruction at the same time, if the charging current of the charging machine is determined to be less than 2A, the set value is backed up, the charging current of the charging machine is modified to 5A, and the capacitor is controlled to be charged according to the terminal charging instruction and the charging current; the variable pitch driver determines whether a discharge related fault occurs in the capacitor charging process, and resets the charge related fault when the charge related fault is determined to occur; calculating the capacitance value of the capacitor when the capacitor is charged, comparing the capacitance value with a preset capacitance value after the capacitance value calculation is completed, determining the health state of the capacitor, simultaneously, controlling the capacitor to stop charging by a zero clearing terminal charging command, controlling the capacitor to exit from the charging state, and controlling the variable pitch driver to enter a reset state;
when the variable-pitch driver is in a recovery state, returning the rectification control authority and the control authority of the charger to the fan controller, switching the rectification control mode from digital control to automatic control, modifying the terminal control of the control mode of the charger to function code control, clearing a charging instruction and a discharging instruction, clearing a timing time and a timeout mark, recovering the charging current of the charger, clearing a charging and discharging fault reset instruction, a fault reset recording frequency and the like; and simultaneously setting a detection completion flag, and controlling the capacitor to switch from the recovery state to the waiting state to wait for the start of the next detection.
The detection efficiency of the health state detection of the capacitor is improved.
The invention also provides a capacitance detection device. The capacitance detection device of the present invention includes:
The first control module is used for controlling the capacitor to discharge when the detection instruction sent by the fan controller is confirmed to be effective, and obtaining a first voltage value of the capacitor;
The second control module is used for controlling the capacitor to charge when the first voltage value meets a first preset condition and obtaining a second voltage value of the capacitor;
And the calculating module is used for calculating the capacitance value of the capacitor when the second voltage value meets a second preset condition and determining the health state of the capacitor based on the capacitance value.
Further, the first control module is further configured to:
obtaining rectification control authority and charger control authority of the fan controller, and generating a rectification-off instruction to control the driver to enter a rectification-off state;
And controlling the capacitor to enter a discharging state for discharging based on the control authority of the charger according to preset time delay, and acquiring a first voltage value of the capacitor when the capacitor is discharged in real time.
Further, the first control module is further configured to:
Comparing the first voltage value with a voltage threshold, and controlling the capacitor to stop discharging and enter an on-rectification state when the first voltage value is smaller than the voltage threshold;
And acquiring bus voltage and target voltage of the capacitor, comparing the bus voltage with the target voltage, and controlling the capacitor to enter a charging state for charging based on the control authority of the charger if the bus voltage is larger than the target voltage, and acquiring a second voltage value of the capacitor for charging in real time.
Further, the computing module is further configured to:
Determining an initial voltage of the capacitor, and comparing a second voltage value of the capacitor when the capacitor is charged with the initial voltage and the target voltage;
When the difference value between the second voltage value and the initial voltage is not smaller than a first threshold value and the difference value between the second voltage value and the target voltage is smaller than a second threshold value, determining the end point voltage of the capacitor according to the second voltage value;
and determining a charging current accumulated value and charging time, and calculating a capacitance value of the capacitor according to the charging current accumulated value, the charging time, the initial voltage and the end voltage.
Further, the first control module further includes a timing module, where the timing module is configured to:
acquiring the effective time of the detection instruction, and performing timing operation by taking the effective time as a timing starting point;
And if the capacitance detection time is determined to be greater than a preset time threshold, generating a detection timeout flag so that the fan controller determines detection timeout according to the detection timeout flag and exits detection.
Further, the first control module and the second control module further include a reset module, where the reset module is configured to:
if the occurrence of related faults is detected, generating a fault reset mark, and resetting the related faults according to the fault reset mark;
Acquiring a reset result, and if the reset result is that the reset is successful, continuously controlling the capacitor to charge or discharge;
and if the reset result is that the reset fails, controlling the exit detection by the fan controller.
Further, the computing module further includes a check generating module for:
if the health state of the capacitor is healthy, generating a restoration instruction, and controlling the capacitor to enter a waiting state according to the restoration instruction;
and if the health state of the capacitor is determined to be unhealthy, generating an alarm instruction, and alarming according to the alarm instruction.
The invention also provides a capacitance detection system.
The capacitance detection system includes: the capacitive sensing device comprises a memory, a processor and a capacitive sensing program stored on the memory and capable of running on the processor, wherein the capacitive sensing program realizes the steps of the capacitive sensing method when being executed by the processor.
The method implemented when the capacitance detection program running on the processor is executed may refer to various embodiments of the capacitance detection method of the present invention, which are not described herein again.
The invention also provides a computer readable storage medium.
A computer-readable storage medium has stored thereon a capacitance detection program which, when executed by a processor, implements the steps of the capacitance detection method as described above.
The method implemented when the capacitance detection program running on the processor is executed may refer to various embodiments of the capacitance detection method of the present invention, which are not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein, or any application, directly or indirectly, in the field of other related technology.
Claims (6)
1. The capacitive detection method is characterized by being applied to a variable pitch drive, and comprises the following steps of:
When the detection instruction sent by the fan controller is confirmed to be effective, the rectification control authority of the fan controller and the control authority of the charger are obtained, and the fan controller enters a rectification closing state, wherein the rectification control mode is switched to digital control by automatic control, and the variable pitch driver sets the rectification instruction to 0 based on the digital control to generate a rectification closing instruction;
according to preset time delay, controlling the capacitor to enter a discharging state for discharging based on the control authority of the charger, and acquiring a first voltage value of the capacitor for discharging in real time;
When the first voltage value meets a first preset condition, controlling the capacitor to charge, and obtaining a second voltage value of the capacitor;
When the second voltage value meets a second preset condition, calculating a capacitance value of the capacitor according to a charging current accumulated value, charging time, initial voltage and end point voltage, and determining the health state of the capacitor based on the capacitance value;
acquiring the effective time of the detection instruction, and performing timing operation by taking the effective time as a timing starting point;
if the capacitance detection time is determined to be greater than a preset time threshold, a detection timeout flag is generated, so that the fan controller determines detection timeout according to the detection timeout flag and exits detection;
When the second voltage value meets a second preset condition, the step of calculating the capacitance value of the capacitor according to the charging current accumulated value, the charging time, the initial voltage and the terminal voltage comprises the following steps:
Determining the initial voltage of the capacitor, and comparing a second voltage value of the capacitor when the capacitor is charged with the initial voltage and a target voltage respectively;
when the difference value between the second voltage value and the initial voltage is not smaller than a first threshold value and the difference value between the second voltage value and the target voltage is smaller than a second threshold value, determining the end voltage of the capacitor according to the second voltage value;
Determining the charging current accumulated value and the charging time, and calculating a capacitance value of the capacitor according to the charging current accumulated value, the charging time, the initial voltage and the terminal voltage;
after the steps of controlling the capacitor to enter a discharging state for discharging and controlling the capacitor to charge based on the control authority of the charger, if the related faults are detected, generating fault reset marks, and resetting the related faults according to the fault reset marks;
Acquiring a reset result, and if the reset result is that the reset is successful, continuously controlling the capacitor to charge or discharge;
and if the reset result is that the reset fails, controlling the exit detection by the fan controller.
2. The method of claim 1, wherein the step of controlling the capacitor to charge and obtaining the second voltage value of the capacitor when the first voltage value satisfies a first preset condition comprises:
Comparing the first voltage value with a voltage threshold, and controlling the capacitor to stop discharging and enter an on-rectification state when the first voltage value is smaller than the voltage threshold;
And acquiring bus voltage and target voltage of the capacitor, comparing the bus voltage with the target voltage, and controlling the capacitor to enter a charging state for charging based on the control authority of the charger if the bus voltage is larger than the target voltage, and acquiring a second voltage value of the capacitor for charging in real time.
3. The capacitance detecting method according to claim 1, wherein when the second voltage value satisfies a second preset condition, the capacitance value of the capacitance is calculated from a charging current accumulated value, a charging time, an initial voltage, and an end point voltage, and the state of health of the capacitance is determined based on the capacitance value, the capacitance detecting method further comprises:
if the health state of the capacitor is healthy, generating a restoration instruction, and controlling the capacitor to enter a waiting state according to the restoration instruction;
and if the health state of the capacitor is determined to be unhealthy, generating an alarm instruction, and alarming according to the alarm instruction.
4. A capacitance detection device, characterized in that the capacitance detection device comprises:
The first control module is used for acquiring rectification control authority and charger control authority of the fan controller and entering a rectification closing state when determining that a detection instruction sent by the fan controller is effective, wherein the rectification control mode is switched from automatic control to digital control, and the variable pitch driver sets the rectification instruction to 0 based on the digital control to generate a rectification closing instruction; according to preset time delay, controlling the capacitor to enter a discharging state for discharging based on the control authority of the charger, and acquiring a first voltage value of the capacitor for discharging in real time;
The second control module is used for controlling the capacitor to charge when the first voltage value meets a first preset condition and obtaining a second voltage value of the capacitor;
The calculation module is used for calculating the capacitance value of the capacitor according to the charging current accumulated value, the charging time, the initial voltage and the terminal voltage when the second voltage value meets a second preset condition, and determining the health state of the capacitor based on the capacitance value; when the second voltage value meets a second preset condition, the step of calculating the capacitance value of the capacitor according to the charging current accumulated value, the charging time, the initial voltage and the terminal voltage comprises the following steps: determining the initial voltage of the capacitor, and comparing a second voltage value of the capacitor when the capacitor is charged with the initial voltage and a target voltage respectively; when the difference value between the second voltage value and the initial voltage is not smaller than a first threshold value and the difference value between the second voltage value and the target voltage is smaller than a second threshold value, determining the end voltage of the capacitor according to the second voltage value; determining the charging current accumulated value and the charging time, and calculating a capacitance value of the capacitor according to the charging current accumulated value, the charging time, the initial voltage and the terminal voltage;
The capacitance detection device is also used for acquiring the effective time of the detection instruction and performing timing operation by taking the effective time as a timing starting point; if the capacitance detection time is determined to be greater than a preset time threshold, a detection timeout flag is generated, so that the fan controller determines detection timeout according to the detection timeout flag and exits detection; after the step of controlling the capacitor to enter a discharging state for discharging and controlling the capacitor to charge based on the control authority of the charger, if the related fault is detected, generating a fault reset mark, and resetting the related fault according to the fault reset mark; acquiring a reset result, and if the reset result is that the reset is successful, continuously controlling the capacitor to charge or discharge; and if the reset result is that the reset fails, controlling the exit detection by the fan controller.
5. A capacitance detection system, the capacitance detection system comprising: a memory, a processor and a capacitance detection program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the capacitance detection method according to any one of claims 1 to 3.
6. A computer-readable storage medium, on which a capacitance detection program is stored, which when executed by a processor implements the steps of the capacitance detection method according to any one of claims 1 to 3.
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| CN104166052A (en) * | 2014-08-04 | 2014-11-26 | 国家电网公司 | Method for detecting super capacitor capacitance value of wind turbine generator pitch system |
| CN111969263A (en) * | 2020-07-20 | 2020-11-20 | 浙江吉智新能源汽车科技有限公司 | Method and device for updating SOH of battery pack in charging and replacing power station |
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| JP2010152876A (en) * | 2008-11-26 | 2010-07-08 | Seiko Instruments Inc | Electrostatic capacitance detection device, electrostatic capacitance detection circuit, electrostatic capacitance detection method and initialization method |
| US9742341B2 (en) * | 2014-06-19 | 2017-08-22 | Mitsubishi Electric Corporation | AC motor drive system |
| WO2016205921A1 (en) * | 2015-06-26 | 2016-12-29 | Clear Blue Technologies Inc. | System and method for charging autonomously powered devices using variable power source |
| CN108032862B (en) * | 2017-12-08 | 2020-01-17 | 中车株洲电力机车有限公司 | Hybrid power supply power system and power supply method for internal combustion motor train unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104166052A (en) * | 2014-08-04 | 2014-11-26 | 国家电网公司 | Method for detecting super capacitor capacitance value of wind turbine generator pitch system |
| CN111969263A (en) * | 2020-07-20 | 2020-11-20 | 浙江吉智新能源汽车科技有限公司 | Method and device for updating SOH of battery pack in charging and replacing power station |
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